Keywords: هگزافلوراکتیل اتئون; ILs; ionic liquids; RE; rare earth; FCC; fluid cracking catalysts; GBCA; Gadolinium Based Contrast Agents; MRI; magnetic resonance imaging; Tf2Nâ (known also as TFSIâ); bis(trifluoromethanesulfonyl)amide; RTIL; room-temperature ionic liquid; C1C3pyr;